[BUG] R2 batch uploads fails with 429 Too Many Requests

[t4nz]

Describe the bug

When attempting to upload cache files to R2 using the new approach with the command:
wrangler r2 bulk put
the upload process fails with the following error:
429: Too Many Requests

This makes it currently possible upload cache files only using the command with arg --cacheChunkSize=1

Steps to reproduce

pnpm opennextjs-cloudflare populateCache remote
pnpm run deploy

Expected behavior

The command should upload multiple files without rate limiting errors, given that the goal of bulk put is to batch upload objects.

@opennextjs/cloudflare version

1.13.0

Wrangler version

4.49.1

next info output

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 25.1.0: Mon Oct 20 19:34:05 PDT 2025; root:xnu-12377.41.6~2/RELEASE_ARM64_T6041
  Available memory (MB): 49152
  Available CPU cores: 14
Binaries:
  Node: 20.10.0
  npm: 10.2.3
  Yarn: 1.22.22
  pnpm: 10.20.0
Relevant Packages:
  next: 15.5.6
  eslint-config-next: N/A
  react: 19.2.0
  react-dom: 19.2.0
  typescript: 5.9.3
Next.js Config:
  output: N/A

Additional context

According to Cloudflare’s documentation (section: Upload objects via Wrangler):

Wrangler’s object put command only allows you to upload one object at a time. Use rclone if you wish to upload multiple objects to R2.

Source: https://developers.cloudflare.com/r2/objects/upload-objects/#upload-objects-via-wrangler

This may indicate that wrangler r2 bulk put is not fully supported for large or parallel uploads, or the underlying implementation is still limited to single-object requests.

[vicb]

@t4nz how many files do you have? how often did you deploy?

[vicb]

The cache files are in .open-next/cache/<buildid>
We probably need to rate limit

[t4nz]

@t4nz how many files do you have? how often did you deploy?

@vicb I have about 6900 files. I tried a deployment after a few weeks

[vicb]

The rate limit is 1200 files per 5 minutes.
So your deploy will take ~30min with the rate limit. We'll work on improving that.
Can you please confirm that updating wrangler to the pre-version from cloudflare/workers-sdk#11367 fixes the 429 (https://pkg.pr.new/wrangler@11367).